Expansible core for molds.



P. 0. MERILLAT. EXPANSIBLE (JOBS FOR MOLDS. APPLICATION FILED. D30. 21,1908.

91 7,636 Patented Apr. 6, 1909.

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314 uaml'or PETER O. MERILLAT, OF WINFIELD, IOWA.

EXPANSIBLE CORE FOR MOLDS.

Specification'of Letters Patent.

Application filed December 21, 1908.

Patented April 6-, 1909'.

Serial No. 468,679.

To all-whom it may concern: Belt known that I, PETER O. MERIL AT, acitizen of the United States, residing atv'infield, in the county ofHenry and State of lowa, have invented certain new and usefulImprovements in Expansible Cores-for Molds; and I do declare thefollowing to be a full, clear, and exact description of the invention,such'as will enable others skilled in the art to which it appertains tomake and use the same.

T his-invention relates to improvements,

ed claim.

In the accompanying drawings, Figure 1 is a horizontal sectional viewthrough a core constructed in accordance with the invention; Fig. 2 is across sectional view of the same on the line 2-2 of Fig. 1; and Fig. 3is a similar view on the line 3+4) of Fig.

In the embodiment of the invention, I providea tubular shaft 1 on whichadjacent to its outer end is secured a sleeve or collar 2, said collarbeing preferably secured to the shaft by a set screw 3. ()n the collaradjacent to one end is formed a series of radially projecting aperturedlugs 4. On the shaft 1 and spaced a-suitable distance from the sleeveorcollar 2 is a second sleeve 5 which is rigidly held in position ont-heshaft by a set screwfi and has formed thereon adjacent to one end aseries of radially projecting-lugs 7. The body or shell of the 'core isformed of a series of segmental overlapping plates which are bolted orotherwise secured to longitudinally disposed angle iron ribs 8. Theupper and lower plates 9 and 10 of the shell extend part way around eachside of the same and are re-inforced by narrow longitudinally disposedplates 12 which are bolted or otherwise secured along the center thereofby the bolts or rivets which secure the plates 9 and 10 to-their angleiron supportin' ribs. The

sides of the cylindrical shell or ody of the core are formed by innerand outer overlap-' ping side plates 13 and 14.. The upper edges of theplates 14 extend beneath the lower edges of the upper plate 9 and saidupper edges of the plates 14 are secured to sup orting ribs, as shown.The upper ed es o the inner side plates 13 are also secureil to angleironribs 8 and said lates 13 are spaced from the outer side p ates 14and between said plates, the upper edges of the lower plate 10 project.The lower edges of the plates 13 project below the angle iron ribs 15but are not secured thereto, said ribs 15 serving simply as guides tobrace the overlapping edges of the guide plates 13 and 14 and the lowerplate 10.

The segmental plates forming the shell of the core are supported inoperative position to form a substantially cylindrical body by means ofradially projecting inclined supporting arms 16 and 17. The outer endsof the arms 16 are pivotally connected at their outer ends to the angleiron ribs 8 and at their inner ends are pivotally connected to the lugs4 of the collar 2. The arms 17 are pivotally connected at their outerends to the ribs 8 and at their inner ends to the lugs 7 on the collar5.

Slidably mounted on the shaft 1 is an expanding sleeve 18 on the innerend of which is formed a series of apertured lugs 19 which are connectedto the arms 17 by links 20. On the outer end of the shaft is screwed asocket 21 and in said end is secured a nut 22,

said nut being provided on its outer end with radially projectingapertured In S 23 through which are inserted'fastening bo ts 24 havinghook-shaped inner 'ends ada ted to engage with the inner end of the socet 21.

Adapted to be screwedin and out of the nut 22 is an expanding screw 25having a reduced outer end 26 whereby a stop shoulder 27 is formed onthe screw. An exapanding yoke 28 is engaged with the reduce end 26 ofthe expandlng screw and has its inner ends bolted or otherwise securedto the collar 18 whereby when'the screw 25 is turned in one direction orthe other in the nut 22, said sleeve 18 will be moved inwardlyoroutwardly thus spreading or retracting the arms 17 by means of theconnecting links 20.

When-the arms 17 are thus spread or 'reare arranged bearing washers Iend of said reduced portion is secured a hand wheel 30 by means of whichthe screw is operated.

By means of an 0 crating mechanism constructed as herein snown anddescribed, the overlapping sections of the core may be readily expandedor retracted, to. vary the size 01' the core or in order to facilitatethis operation, I provide a coil spring 31 one end oi which is securedto the fixed collar 2 by a connecting rod 32, while the opposite end ofthe spring is secured to the slidmg collar 18 by a connecting r0d33. Thetendency of the sprin 31 is to draw the sliding sleeve 18 inward y andthus aid the movement of the sleeve by the expanding screw hereinbel'oredescribed, which will permit the screw to be' readily turned by the handwheel 30. The addition of the retracting spring 31 will be foundespecially desirable when the core rests upon the ground or isunsupported which necessitates the lifting of a greater part of thestructure when the segmental plates of the shell are expanded.

In the construction of the core, I prefer-- ably secure the segmentalplates to the ribs 8 by means of bolts 32 on the inner portions of whichbetween adjusting nuts 33 and the ribs areal-ranged coiled springs 34 bymeans of which a yielding connection is formed between the ribs andplates to permit thelatter to adjust themselves when thearms 16 and '17are operated to increase or diminish the size of the core. In connectionwith the core, I prefer to employ adjustable guide hoops 35 which areadjusted to the size it is desired the core should be and one of saidhoops is then engaged with each end of the core. The core is thenexpanded until the segmental plates engage the hoops whichwill'accurately determine the size of the core and prevent fur- 29 andon the ther expansion of the same.

The'hoop may be adjusted in any suitable manner to increase or diminishthe size of the same and is here shown as having on one end a stud 36adapted to be engaged with one of a series of apertures 37 formed in theopposite end as, shown in Fig. 2 of the drawings.

From' the fore oing description, taken-in connection with t isaccompanying drawings, the construction and operationoi' the inventionwill be readily understood without requiringa more extended explanation.

Various changes in the form, proportion and the minor details ofconstruction may be resorted to without departing from the 'principle orsacrificing any oi the advantages of the invention as defined in theappended claim.

laving thus described and explained the nature of my invention, whatlclaim as-new and desire to secure by Letters-Patent is:

In a core of the character described, a tubular shai't, a series ofcollars fixedly secured to said shaft, a series of supporting ribs,supporting arms to pivotally connect said ribs with said collars, aseries of overlapping segmental plates secured to said ribs to form thebody of the core, an adjusting collar slidahle on said shai't, aretracting spring to connect said collar with one of the fixed collarson the shaft, and an expanding screw operativcly connected with saidcollar whereby the latter is pro ected and retracted to expand andrctract the sections of the core.

1n testimony whereof l have hereunto set my hand inpres'ence of twosubscribing witnesses.

PETER I. M Elillilinf l. Witnesses: I

AUnA ISLOAN, G. A. KIZBAUII.

